Strain IB-1, which is initially sensitive to nalidixic acid, was screened for spontaneous nalidixic-resistant mutans by cultivating it repeatedly at media suplemented with that antibiotic.
Strain IB-1, whichis initially sensitive to nalidixic acid, was screened for spontaneousnalidixic-resistant mutans by cultivating it repeatedlyat media suplemented with that antibiotic.